I-52
FX Series PLC User's Manual - Data Communication Edition
Remote Maintenance
8 Troubleshooting
8.6 Checking Setting in PLC
8.6.2 Checking AT command setting
The AT command is required when "user registration mode", "PP modem mode (ch 1)" or "PP modem mode
(ch 2)" is selected in the modem initialization setting. When such a mode is set, check the following contents.
1. Checking data registers
The head device number and device range of data registers used for setting the AT command vary
depending on the FX Series.
Check the data register numbers in which the AT command is set.
Use consecutive data registers from the head device number. If a numeric value is not set in a data register,
the data registers after it are not transferred.
2. Checking the contents of the AT command
If the contents of the AT command are not correct, remote maintenance cannot be used.
Verify that the setting contents are correct.
As reference, the table below shows the set items and their contents of the AT commands already registered
in PLCs.
3. Checking "CR (H0D)" and "LF (H0A)"
Make sure to input "CR (H0D)" and "LF (H0A)" at the end of the AT command. If they are not input, the AT
command cannot be transferred.
→ For the AT command setting for the PLC, refer to Chapter 5.
FX Series Device range
FX
3G/FX3U/FX3UC PLC D1000 to D1059
FX
2N/FX2NC PLC D1000 to D1059
FX
1N/FX1NC PLC D1000 to D1059
FX
1S PLC D200 to D255
Set item
PV-AF288 (AIWA)
ATE0S0 = 2Q1&D0&M5\Q0\J0&W
ME3314B (OMRON)
ATE0S0 = 2Q1&D0&H0&R1S15=8&W
Command echo E0 (not provided) E0 (not provided)
Number of times of calling in
automatic receiving
S0 = 2 (twice) S0 = 2 (twice)
Result code display Q1 (not provided) Q1 (not provided)
DTR control &D (normally ON) &D (normally ON)
Communication mode &M5 (V. 42 bis) S15 = 8 (V. 42 bis)
Terminal flow control method \Q0 (not provided) &R1 (not provided)
Send data flow control — &H0 (not provided)
Terminal speed fixing mode \J0 (fixed) —
Writing to nonvolatile memory &W &W
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